Patents Issued in March 2, 2004
  • Patent number: 6700225
    Abstract: A standard high voltage circuit having a light bulb therein as a load. A low voltage DC circuit has a plurality of parallel manually actuated switches, with output contacts in the high voltage circuit and inputs in the low voltage circuit. A 7414 chip is provided to debounce the DC imposed on the low voltage circuit by the manual switches, and a chip with a toggle function is positioned in series between the 7414 chip and the high voltage circuit. Each manually actuated switch is capable, in each full throw thereof, of producing an OFF/ON/OFF, or ON/OFF/ON sequence.
    Type: Grant
    Filed: October 5, 1999
    Date of Patent: March 2, 2004
    Inventor: Thomas C. Barmore
  • Patent number: 6700226
    Abstract: A transistor includes a substrate region (14) of a first type (P) of conductivity in a semiconductor material layer of the same type (P) of conductivity, at least a first contact region (13) of the first type (P+) of conductivity inside the substrate region (14) and adjacent to a first terminal (C) of the transistor, a well (11) of second type (N) of conductivity placed inside the substrate region (14), wherein the well (11) of second type (N) of conductivity includes at least a second contact region (12) of a second type of conductivity (N+) adjacent to a region of a second terminal (B) of the transistor, and a plurality of third contact regions (10) of the first type of conductivity (P+) adjacent to a plurality of regions of a third terminal (E1, . . . , E3) of the transistor interposed each one (10) and other (12) by proper insulating shapes (20).
    Type: Grant
    Filed: December 27, 2001
    Date of Patent: March 2, 2004
    Assignee: STMicroelectronic S.r.l.
    Inventors: Loris Vendrame, Paolo Caprara, Giorgio Oddone, Antonio Barcella
  • Patent number: 6700227
    Abstract: A direct electrodynamic linear drive comprising a drive coil system composed of coils arranged in a row alongside each other on an elongated ferromagnetic core, which coil is able to be supplied with a switched exciting voltage. The drive coil system has a ferromagnetic tube fitting around it, on whose inner side a plurality of permanent magnets are arranged in a row in the longitudinal direction of the tube. The core provided with the drive coil system is adapted to function as a stator and the tube having the permanent magnets as an armature. In this arrangement the ferromagnetic tube serves as a guide tube, as a magnetic return member and as a holder means for the permanent magnets, the possibility of a simple and accurate longitudinal guiding of the tube meaning that elongated units with a small cross section may be manufactured.
    Type: Grant
    Filed: March 14, 2001
    Date of Patent: March 2, 2004
    Assignee: Festo AG & Co.
    Inventor: Ralf Hartramph
  • Patent number: 6700228
    Abstract: A linear motor system for a driving apparatus comprises a first linear motor having a primary side to which either one of first and second movable elements which are relatively movable with respect to each other, and a secondary linear motor having a secondary side mounted to this one of first and second movable elements so as to extend in the relatively movable direction to be continuous to the primary side of the first linear motor. The second linear motor has a primary side mounted to another one of the first and second movable elements, and the first linear motor also has a secondary side mounted to the another one of the first and second movable elements so as to extend in the relatively movable direction to be continuous to the primary side of the second linear motor.
    Type: Grant
    Filed: December 20, 2001
    Date of Patent: March 2, 2004
    Assignee: THK Co., Ltd.
    Inventors: Akihiro Teramachi, Takeki Shirai, Kaoru Hoshide
  • Patent number: 6700229
    Abstract: An electrical machine with at least a machine unit. The machine unit includes a stator, which includes a plurality of magnetic flux conductors and an electric conductor forming a winding extending in a substantially closed winding path through each magnetic flux conductor, and a movable element, which includes permanent magnet elements movable in a reciprocating movement in relation to the stator along a movement path. The winding path includes a first current carrying portion, which extends substantially in parallel with the movement path. Each magnetic flux conductor is arranged to form, together with one of the permanent magnet elements, a closed magnetic flux circuit extending around the current carrying portion. The magnetic flux conductors are arranged in an alternating order with respect to the direction of the magnetic flux in relation to the permanent magnet elements in the respective magnetic flux circuit.
    Type: Grant
    Filed: October 7, 2002
    Date of Patent: March 2, 2004
    Assignee: ABB AB
    Inventors: Chandur Sadarangani, Lars Gertmar, Waqas Arshad, Thomas Bäckström
  • Patent number: 6700230
    Abstract: A linear actuator includes a moving part which has a facing surface and which is provided such that the facing surface of the moving part faces a facing surface of a stator. The moving part is lonearly movable. A permanent magnet is provided in one of the stator or the moving part and has a magnet surface facing the facing surface of another of the stator or the moving part. A cross-sectional area of the permanent magnet along a first plane substantially in parallel with the facing surface of the one of the stator or the moving part reduces toward the magnet surface.
    Type: Grant
    Filed: October 18, 2002
    Date of Patent: March 2, 2004
    Assignee: Matsushita Electric Works, Ltd.
    Inventor: Halit S. Gokturk
  • Patent number: 6700231
    Abstract: A thrust converter includes reciprocation movement means 1; reciprocation-rotation conversion means 2 for converting reciprocating movement of the reciprocation movement means into rotational movement; rotation-reciprocation conversion means 7 for converting rotational movement of the reciprocation-rotation conversion means; and reaction-force receiving means 11 for supporting reaction force stemming from reciprocation movement of the rotation-reciprocation conversion means. Thrust imparted to the reciprocation movement means can be imparted to a load while being amplified or reduced, through employment of a compact and simple construction.
    Type: Grant
    Filed: December 31, 2001
    Date of Patent: March 2, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kouichi Takamune, Seiichi Mimura, Hidenobu Ito, Yoshiyuki Hatsutori, Yoshio Kasuga, Takao Mizutani
  • Patent number: 6700232
    Abstract: A solenoid valve achieves high reliability and small size with fine tolerance. The solenoid valve having a valve housing, an electromagnet composed of a coil, a yoke and a clapper armature having at least a first valve seat, and a sealing element which can be actuated by the clapper armature and which co-operates with the first valve seat. The yoke has yoke pins and the clapper armature is magnetically and pivotally connecting with one of the yoke pins at the end thereof that is remote from the sealing element. The clapper armature is guided through the coil.
    Type: Grant
    Filed: June 30, 2001
    Date of Patent: March 2, 2004
    Assignee: Nass Magnet GmbH
    Inventors: Frank Rieck, Robert Bast, Carsten Fritz, Holger Wagner, Ralf Hiddessen, Jan-Peter Ossenbrugge
  • Patent number: 6700233
    Abstract: A prime mover using a split coil for magnetically inducing movement of a steel piston. The magnetic effects are emphasized in higher reciprocating movement by the proximate introduction of a permanent magnet. The prime mover is sparkless, brushless, quiet, low friction, and can operate on a wide array of voltages, including high frequency very low voltage signals.
    Type: Grant
    Filed: December 7, 2000
    Date of Patent: March 2, 2004
    Inventor: Frank Cordiale
  • Patent number: 6700234
    Abstract: An electromotive device includes an outer casing, a shaft supported by the outer casing, a bobbin disposed inside the outer casing so as to be disposed around the shaft on a common axis with the shaft, and a coil embedded in an outer molding, the coil being constructed by winding a conducting wire onto the bobbin, the bobbin and the outer molding being composed of an epoxy resin, which is an electrically-insulating material resistant to permeation by sulfur compounds.
    Type: Grant
    Filed: June 28, 2001
    Date of Patent: March 2, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Naoya Hashimoto, Teruo Miyaoku, Shiro Hasegawa, Chiaki Sugano, Hiromasa Ozawa, Hirohisa Ohta
  • Patent number: 6700235
    Abstract: A rotating machine has a case with an exterior surface, a pulley end, an opposite end, and an interior working chamber. A rotary shaft is mounted for rotation within the interior working chamber between the pulley end and the opposite end. At least one machine component is supported for rotation on the rotary shaft. At least one air inlet and at least one air outlet are formed through the case. A first fan is supported for rotation on the rotary shaft within the interior of the case and is arranged for pulling air through the air inlet into the interior working chamber of the case and for pushing air out the air outlet from the interior working chamber of the case. A cowl is received over the opposite end of the case. The cowl defines a plenum between an interior surface of the cowl and the case and also defines an annular air opening around a perimeter of the cowl and the case.
    Type: Grant
    Filed: October 18, 2000
    Date of Patent: March 2, 2004
    Assignee: Franklin Electric Co.
    Inventor: David D. McAfee
  • Patent number: 6700236
    Abstract: A liquid-cooled vehicle generator-motor includes a frame having a liquid passage, a stator core fixedly fitted to the inner periphery of the frame, a multi-phase stator winding accommodated in the plurality of slots of the stator core, and a rotor disposed inside the stator core. The stator winding includes a plurality of insulated U-shaped conductor segments each of which has a pair of legs. Each leg is inserted in a slot from one end of the stator core and paired to another at a portion extending from the other end of the stator.
    Type: Grant
    Filed: November 29, 2000
    Date of Patent: March 2, 2004
    Assignee: Denso Corporation
    Inventors: Atsushi Umeda, Tsutomu Shiga
  • Patent number: 6700237
    Abstract: An air cooler device for an enclosed rotational electrical machine includes an air inlet and an air outlet provided in the casing of the electrical machine, and a fan simultaneously driven by the machine's power output shaft, an independently installed fan device, or both a simultaneously driven and an independently installed fan device. The fan or fans pump air or other selected gases inside the rotational electrical machine to allow a cooling air stream to flow through the outlet to an air cooler for indirect heat dissipation, and then back to the rotational electrical machine through the inlet.
    Type: Grant
    Filed: July 28, 2000
    Date of Patent: March 2, 2004
    Inventor: Tai-Her Yang
  • Patent number: 6700238
    Abstract: A generator gas shield includes an annular ring body having an outer radially extending flange terminating at a first free end of a first diameter; a curved inlet portion; a substantially axial portion surrounding a center opening, and a curved outlet portion terminating at a second free end of a second diameter smaller than the first diameter.
    Type: Grant
    Filed: August 13, 2002
    Date of Patent: March 2, 2004
    Inventor: Wei Tong
  • Patent number: 6700239
    Abstract: An alternator includes a rear-end fan which is constructed so as to have greater capacity than a front-end fan. The construction is such that a flow rate in a front-end ventilation pathway in which a cooling air flow enters through front-end air intake apertures is deflected centrifugally by the front-end fan and is then expelled through front-end air discharge apertures is greater than a flow rate in a rear-end ventilation pathway in which a cooling air flow enters through rear-end air intake apertures is deflected centrifugally by the rear-end fan and is then expelled through rear-end air discharge apertures.
    Type: Grant
    Filed: January 26, 2001
    Date of Patent: March 2, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshihito Asao, Katsumi Adachi
  • Patent number: 6700240
    Abstract: A stepping motor comprises a permanent magnet type rotor with a plurality of poles secured to a rotating shaft and a stator having stator magnetic poles with stator magnetic pole teeth in which excitation windings are wound on a plurality of magnetic poles in a star or delta connection, wherein the rotor is magnetized in different directions alternately circumferentially to satisfy the following equation: M=4F/3 where M is the number of poles of the rotor and F is the number of the stator magnetic poles, the rotor is cylindrical in shape with the stator rotatably disposed inside, disposed opposing the surfaces of the stator magnetic pole teeth through an air gap which is of a uniform dimension throughout the circumference between the surfaces of the stator magnetic pole teeth of the stator and the rotor, and the surface magnetic flux distribution thereof has a substantially sinusoidal wave form circumferentially.
    Type: Grant
    Filed: December 14, 2001
    Date of Patent: March 2, 2004
    Assignee: Minebea Co., Ltd.
    Inventor: Naotaka Akiwa
  • Patent number: 6700241
    Abstract: A positioning device for a prestressing magnet of a spindle motor includes a stator, a positing member, a prestressing magnet, a rotor and a metal casing. Combined with the prestressing magnet, the positioning member is fittingly secured to a generally axially extending surface at a selected position on the stator while the metal casing is secured to the rotor. After combining the stator with the rotor, the prestressing magnet is axially aligned with the metal casing. An axially magnetic force generated between the prestressing magnet and the metal casing maintains balanced rotation of the rotor.
    Type: Grant
    Filed: November 27, 2002
    Date of Patent: March 2, 2004
    Assignee: Sunonwealth Electric Machine Industry Co., Ltd.
    Inventors: Alex Horng, Tso-Kuo Yin
  • Patent number: 6700242
    Abstract: A magnetic flux control means for a motor-generator, in which an annular member regulates the magnetic flux while the on-off operation of a switching means provides more than one constant voltage depending on the rpm of the rotor. A stator contains high-tension windings, low-tension windings and variable-voltage windings. A controller conducts the switching operation among the windings to produce any desired voltage of, for example a high-tension of 100V, a low-tension of 27V for automotive electrical equipment and a variable voltage for control of an actuator. The annular member may be arranged for angular movement with respect to the stator, either outside or inside the stator.
    Type: Grant
    Filed: August 10, 2001
    Date of Patent: March 2, 2004
    Inventor: Hideo Kawamura
  • Patent number: 6700243
    Abstract: An automotive alternator secures a fastening force for a vehicular connecting terminal for an extended period of time, and restricts the axial displacement of an output terminal, thus ensuring higher reliability. The output terminal is press-fitted and secured in a through hole in a first cooling plate, and the takeout end thereof is drawn out of an opening of a rear bracket. A metal bush is loosely inserted in an insulating bush and externally fitted to the output terminal, and the vehicular connecting terminal is fasteningly secured to the metal bush by a nut. With this arrangement, the fastening force of the nut is received by the rear surface of the first cooling plate via the metal bush. A flange of the metal bush is positioned so that a gap is provided between the flange and the insulating bush. The axial displacement of the output terminal is restricted by the flange abutting against the insulating bush.
    Type: Grant
    Filed: November 4, 2002
    Date of Patent: March 2, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Yoshihito Asao
  • Patent number: 6700244
    Abstract: A 3-in-1 motor power system comprises a motor body, a drive control mechanism, and a power transmission mechanism. A drive control circuit box is installed at an end face of the motor body, and a gear housing wherein a deceleration gear module is disposed is installed at the other end face thereof. A circuit board is disposed at an end face of the motor' stator. Stator's signals are transmitted via signal conducting needles to a drive control circuit in the circuit box. A rotor's lower bearing seat is disposed at the other end face of the motor's stator. A solar gear is disposed at the tail end of the rotor's axle, and engages planetary gears of the deceleration gear module. A deceleration gear seat is separately installed at the outer end face of the rotor's lower bearing seat. The deceleration gear module is received in the deceleration gear seat.
    Type: Grant
    Filed: June 4, 2002
    Date of Patent: March 2, 2004
    Inventor: Chun-Pu Hsu
  • Patent number: 6700245
    Abstract: A rotatable shaft of a motor main body and a worm shaft of a speed reducing unit are drivingly coupled to each other by a clutch. Surrounding walls, which are arranged radially outward of the clutch to substantially entirely surround the clutch in an imaginary plane that extends substantially perpendicular to the axis of the worm shaft, are formed integrally with a gear housing. Thus, the surrounding walls restrain outward movement of grease, which is applied to predetermined portions of the clutch, so that effluence of the grease from the clutch is restrained.
    Type: Grant
    Filed: December 9, 2002
    Date of Patent: March 2, 2004
    Assignee: Asmo Co., Ltd.
    Inventors: Kengo Yamamura, Toshihiro Saitou, Hiroaki Yamamoto, Youichi Matsuyama
  • Patent number: 6700246
    Abstract: A tube motor with an electric motor drive with a drive shaft located in a gear box. A reducing gear with a driven shaft is located in a gear box and coupled with the drive shaft via a gear input shaft for rotary securing of the driven shaft especially when the drive is disengaged. A wrap spring brake with a wrap spring works against the gear box, while the drive shaft and the gear input shaft work together with the wrap spring. Located between the wrap spring and the gear housing and secured against torsion is an annular element which diverts a moment introduced by the driven shaft into the gear housing.
    Type: Grant
    Filed: November 3, 2000
    Date of Patent: March 2, 2004
    Assignee: Valeo Auto-Electric Wischer und Motoren GmbH
    Inventor: Rainer Bruhn
  • Patent number: 6700247
    Abstract: Disclosed is a permanent magnet generator incorporated in a 3.5″ diskette that can be used as an input/output adapter for memory cards that can generate a power generation output of 40 mW or more when the rotor of the generator is rotated at 300 rpm. The permanent magnet generator has such a construction that rotor magnetic poles are provided only on one end face of a disc-shaped permanent magnet serving as a rotor, a plurality of stator magnetic poles are provided only on that end face of the permanent magnet in such a manner as to face the rotor magnetic poles, and a soft magnetic hub is fixedly fitted to the other end face of the permanent magnet. Even when a bonded NdFeB magnet is used as the permanent magnet, a sufficient power can be produced.
    Type: Grant
    Filed: May 23, 2001
    Date of Patent: March 2, 2004
    Assignee: Hitachi Metals, Ltd.
    Inventors: Masahiro Masuzawa, Masahiro Mita, Fumio Kimura, Toshiko Takahashi
  • Patent number: 6700248
    Abstract: A non-linear magnetic harmonic motion converter apparatus for transferring non-linear motion into rotational motion for producing work from an interaction of at least two magnetic fields. An axial shaft is disposed in rotating relationship with at least one gimbal supported magnet that reciprocates in relation to the axial shaft. At least one rotor magnet is disposed to rotate in relation to the axial shaft in response to non-linear movement of the at least one gimbal supported magnet. A plurality of rotor magnet units may be proximally disposed to rotate about separate axial shafts, with each rotor magnet unit having a rotor magnetic field influenced by the non-linear movement of the at least one gimbal supported magnet disposed proximal to each rotor magnet unit. Movement of the each gimbal supported magnet creates repulsion and attraction of each respective rotor magnet, with inducement of axial shaft rotation, thereby producing rotational movement that is harnessed to perform work.
    Type: Grant
    Filed: May 9, 2002
    Date of Patent: March 2, 2004
    Assignee: Harmonic Drive, Inc.
    Inventor: Johnny D. Long
  • Patent number: 6700249
    Abstract: A direct drive vertical lift and rotation stage comprises an annular z-axis housing having a central opening, a z-axis rotor assembly journaled within the central opening of the z-axis housing, a motor between the z-axis housing and the z-axis rotor, an annular theta-axis housing having a central opening, a theta-axis rotor assembly journaled within the central opening of the theta-axis housing, and a motor between the theta-axis housing and the theta-axis rotor.
    Type: Grant
    Filed: November 19, 2002
    Date of Patent: March 2, 2004
    Assignee: Aerotech, Inc.
    Inventor: Stephen J. Botos
  • Patent number: 6700250
    Abstract: In order to provide a vibration motor which can make a starting force strong with maintaining saving electric power and increase a vibration force, in the vibration motor, a facing gap between a central salient pole and a pair of auxiliary salient poles are shifted and arranged around a rotating shaft with non-centrosymmetry and a facing gap between the central salient pole and the field magnet is formed narrower than facing magnets between the auxiliary salient poles and the field magnet. Further, an exciting force of the central salient pole is greater than that of the auxiliary salient poles and in starting, the same magnetic pole as the magnetic pole of the field magnet generates in a facing surface of the central salient pole and a repulsive force occurs so that the armature core is urged to rotate.
    Type: Grant
    Filed: October 19, 2001
    Date of Patent: March 2, 2004
    Assignees: Entac Co., Ltd., O Planning Co., Ltd.
    Inventor: Tomoyuki Miyasaka
  • Patent number: 6700251
    Abstract: A cup-shaped yoke is axially movably provided in a cylindrical frame, and a cylindrical permanent magnet is securely provided in the yoke. A coil bobbin is cantilevered in the frame and inserted in a space between the yoke and the permanent magnet, and a driving coil is mounted on the coil bobbin. The yoke is held by a pair of coil springs for resiliently holding the yoke in the frame.
    Type: Grant
    Filed: October 29, 2002
    Date of Patent: March 2, 2004
    Assignee: Citizen Electronics Co., Ltd.
    Inventors: Takashi Kobayashi, Masaki Tohyama, Kenshi Aihara, Akira Nikaido, Kazumi Miyamoto, Naoki Miura
  • Patent number: 6700252
    Abstract: A modular electric motor for use in a wellbore. The modular motor includes a plurality of modular motor sections. The modular motor sections being mechanically and electrically coupleable. At least one modular motor section having a rotor. The rotor of one modular motor section having a rotor being drivingly coupleable to the rotor of a second modular motor section having a rotor. Thus, a given motor may be assembled to a variety of desired lengths by connecting the appropriate number of modular motor sections.
    Type: Grant
    Filed: December 21, 2000
    Date of Patent: March 2, 2004
    Assignee: Schlumberger Technology Corp.
    Inventors: Roy R. Fleshman, Rick Bailey
  • Patent number: 6700253
    Abstract: The present invention is a motor which has a motor casing (5) and a reduction gearing casing (7) integrally formed, a hole (8) formed on a portion shared by these casings, through which an output shaft (3a) of a rotor (3) extends from the motor casing side to the reduction gearing casing side, and a lubrication oil (9) filling the reduction gearing casing. And, a method for producing a motor comprises the step of charging a resin (11) into and curing it in the motor casing to adhere the resin to a coil of an armature and the inner surface of the motor casing. Besides, the motor casing (5) has a first casing member (510), a second casing member (520) and a third casing member (530) for covering a control section (4), and the first casing member is assembled with the second casing member, and the first casing member is assembled with the third casing member.
    Type: Grant
    Filed: January 18, 2002
    Date of Patent: March 2, 2004
    Assignee: Tokyo R & D Co., Ltd.
    Inventors: Nobuto Ohnuma, Toru Yosizawa, Osamu Watanabe
  • Patent number: 6700254
    Abstract: A connection between a tubular housing 10 and an end cap 20 of a miniature electric motor is made tight by using a circumferentially extending finger 16 on the housing which is bent radially to engage a lip 32 in a recess 30 in the end cap 20 whereby radial deformation of the finger 16 causes an axial clamping of the end cap 20 to the housing 10 without any separation caused by spring back of the finger 16 following deformation.
    Type: Grant
    Filed: February 20, 2002
    Date of Patent: March 2, 2004
    Assignee: Johnson Electric S.A.
    Inventor: Ben To Fan Wong
  • Patent number: 6700255
    Abstract: A bearing system that includes a bearing 50 supported in a flexible bearing bracket, for example for use in fractional horsepower shaded pole type electric motors. The bearing system is self aligning, the bracket being able to deflect to compensate for deviations in the radial alignment of the rotor shaft. A rotation lock restrains the bearing against rotation within the bracket. In the preferred embodiment the bracket is composed of an elastomer and the bearing is composed of a high performance plastic polymer, so that the bearing system is non-lubricating.
    Type: Grant
    Filed: November 1, 2000
    Date of Patent: March 2, 2004
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Christopher Scott Stenta
  • Patent number: 6700256
    Abstract: In a brushless motor, a projected annular portion is formed in a central portion of a rotor frame and the projected annular portion has a bore that includes a small-bore portion and a large-bore portion. A length L1 of the small-bore portion is in a range of D×0.05≦L1≦D×0.20, where D represents the diameter of the shaft. An axial length L2 of the projected annular portion is arranged to satisfy L2≧L1×2. Thus, the brushless motor realizes a small and thin construction and has a high deflection precision as well as high productivity.
    Type: Grant
    Filed: October 23, 2001
    Date of Patent: March 2, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hideshi Fukutani, Hiroshi Ikeno, Norimasa Takata
  • Patent number: 6700257
    Abstract: A bearing fixed assembly in a direct current fan includes a fan base, a motor unit, and a fan blade unit. The motor unit fits with the fan base and the fan blade unit is attached to the fan base and the motor unit with a spindle to constitute an integral structure. The fan base at the top thereof has an annular recess to form an inner ring and an outer ring and at the lower central area thereof has a closed chamber filled with lubrication oil. A stop ring is disposed in the annular recess to support the outer ring such that the motor unit can be sustained from deviation.
    Type: Grant
    Filed: November 14, 2001
    Date of Patent: March 2, 2004
    Assignee: Asia Vital Components Co., Ltd.
    Inventor: Johnny Lin
  • Patent number: 6700258
    Abstract: A magnetic thrust bearing having a high speed rotation capability and low cost construction. The magnetic thrust bearing has permanent magnets to provide bias flux. The magnetic circuits of the control flux and bias fluxes are substantially non-coincident, which allows for a low reluctance and efficient path for the control flux. The flux paths of the permanent magnets are completely defined with minimized airgaps for achieving higher forces and efficiency and very low control currents produce extremely large forces. No radially magnetized permanent magnets are required and no permanent magnets are attached to the rotor.
    Type: Grant
    Filed: May 23, 2001
    Date of Patent: March 2, 2004
    Assignee: Calnetix
    Inventors: Patrick T. McMullen, Co Si Huynh
  • Patent number: 6700259
    Abstract: A magnetic repulsion-actuated magnetic bearing is constructed to include a stator, two magnetic repulsion modules mounted inside the stator, a rotor having two annular permanent magnets at the ends corresponding to the two magnetic repulsion modules. A magnetic force of repulsion is produced between equiangularly spaced permanent magnets of the magnetic repulsion modules and the annular permanent magnets of the rotor to keep the rotor radially in position automatically upon power failure. A controller is electrically connected to windings of the magnetic repulsion modules for controlling the current of the windings to change the intensity of magnetic force so as to further control the radial magnetic force of repulsion of the magnetic repulsion actuators, keeping the radial bearing stiffness during rotation of the rotor.
    Type: Grant
    Filed: February 20, 2003
    Date of Patent: March 2, 2004
    Assignee: Industrial Technology Research Institute
    Inventors: Kang-Ning Lin, Fong-Tan Yu, Se-Kang Ho
  • Patent number: 6700260
    Abstract: A rotor structure of a motor is provided. The rotor structure includes a magnet having a first annular wall, a magnet holder having a base and a second annular wall connected with the first annular wall of the magnet for fixing the magnet, a shaft having one end mounted through the base of the magnet holder, and a stopper mounted in the other end of the shaft.
    Type: Grant
    Filed: December 19, 2000
    Date of Patent: March 2, 2004
    Assignee: Delta Electronics, Inc.
    Inventors: Kuotung Hsu, Chih-Chang Chen, Chi-Ming Yu
  • Patent number: 6700261
    Abstract: A motor has a stator including a coil bobbin with winding sections to be wound by windings and a terminal section. The terminal section outwardly protrudes in a radial direction of the coil bobbin and has fixed protruded terminal pins that are to be connected to winding start sections and wiring end sections of the windings. A curled case is placed over an exterior of the windings of the stator. The curled case has end sections in the peripheral direction and an opening section defined by the end sections of the curled case. The terminal section protrudes through the opening section, and an opening angle of the opening section is less than one half of the entire periphery of a circle.
    Type: Grant
    Filed: May 23, 2001
    Date of Patent: March 2, 2004
    Assignee: Sankyo Seiki Mfg. Co., Ltd.
    Inventor: Eiji Mayumi
  • Patent number: 6700262
    Abstract: A rotary electric machine such as a fan motor or the like capable of coupling a bearing holder and an insulator to each other without deteriorating accuracy of a diameter of an inner peripheral surface of the bearing holder on which bearings are held. The bearing holder and insulator are coupled to each other by a coupling structure, which is constituted by at least one recess formed on a forward end of the bearing holder and at least one projection provided on the insulator and tightly fitted in the recess. The projection and recess thus fitted together are concurrently heated at a peripheral portion thereof for deformation, resulting in being coupled to each other.
    Type: Grant
    Filed: August 30, 2001
    Date of Patent: March 2, 2004
    Assignee: Sanyo Denki Co., Ltd.
    Inventors: Honami Osawa, Munenori Takakuwa, Ryuji Kobayashi, Yukio Ouchi
  • Patent number: 6700263
    Abstract: An electrical generating system including an electric motor coupled to a power source, such as a solar panel array. A magnetic coupling is connected to an output shaft of the motor. The magnetic coupling includes opposed first and second plates each having permanent magnets affixed thereto and arranged such that rotation of the first plate by the motor causes the second plate to rotate by repulsive magnetic force. A gear assembly having a high transmission ratio is connected to the magnetic coupling. Preferably, at least one electrical generator is connected to the gear assembly for generating electricity.
    Type: Grant
    Filed: August 6, 2002
    Date of Patent: March 2, 2004
    Inventors: Carl Cheung Tung Kong, John Kong
  • Patent number: 6700264
    Abstract: An induction pump driving system has a motor shaft, a pump shaft, a first magnetization body, a second magnetization body, an electrical coil, a yoke, and a nonmagnetically electrical-conducting body. The first magnetization body is mounted on the motor shaft and is driven by the motor shaft. The second magnetization body is provided inside a seal cover that is provided at one end of the pump shaft. The first magnetization body, the second magnetization body, the electrical coil, and the yoke are configured to constitute a closed magnetic path. The rotation of the motor shaft is configured to change the magnetic flux of the closed magnetic path to have the nonmagnetically electrical-conducting body, which is coupled with mechanical means, induced with an eddy current and thus, exert an electromagnetic force on the body so as to rotate the pump shaft.
    Type: Grant
    Filed: September 7, 2001
    Date of Patent: March 2, 2004
    Inventor: Hsu Min Chu
  • Patent number: 6700265
    Abstract: An eddy current retarder having a rotor part of the retarder with symmetry of revolution about the axis of the engine shaft so that it has a peripheral face facing a peripheral face of the stator part, the inductor of the retarder having at least one electromagnetic winding. Thus, the Eddy current retarder maintains a compact structure while at the same time allowing simple and easy control over its magnetic flux by virtue of the presence of electromagnets.
    Type: Grant
    Filed: September 24, 2001
    Date of Patent: March 2, 2004
    Assignee: Telma
    Inventor: Stefan Bouissou
  • Patent number: 6700266
    Abstract: A device is presented having a first and a second motor control device. The first and the second motor control devices control rotation speed of a motor. The first or the second motor control devices continue to control rotation speed of the motor upon failure of either the first or the second motor control device. Also presented is a device having at least one motor. The at least one motor having at least one pair of bifilar windings. A further device is presented having at least one motor. The at least one motor having at least eight magnetic lobes. Another device is presented having a first motor connected to a shaft. A second motor is connected to the shaft. A fan hub is connected to the shaft. A fan blade is connected to the fan hub.
    Type: Grant
    Filed: January 2, 2002
    Date of Patent: March 2, 2004
    Assignee: Intel Corporation
    Inventors: Casey R. Winkel, Robert J. Fite, Tomm V. Aldridge, Donovan D. Van Sleet
  • Patent number: 6700267
    Abstract: A transverse flux drive includes a first component and a second component which is rotatable with respect to the first component. A pair of transverse flux motor units are coupled between the first and second components. Each motor unit includes a plurality of U-shaped armature elements which are coupled to the first component and which enclose an circumferentially extending exciter winding. Each motor unit also includes a plurality of permanent magnet pole elements coupled to the second component. The pole elements of one motor are axially movable to attenuate the magnetic flux coupling between the elements of the motor.
    Type: Grant
    Filed: January 25, 2002
    Date of Patent: March 2, 2004
    Assignee: Deere & Company
    Inventor: Heinz Weiss
  • Patent number: 6700268
    Abstract: A rotational electric machine in which a rotor having different-polarity field magnets arranged alternately in a rotational direction is divided axially into two rotor portions so that the axial position of one of the two rotor portions is changed relative to that of the other in accordance with a direction of torque of the rotor or the phase of synthesized magnetic poles of the field magnets is changed relative to that of magnetic poles of the other rotor portion in accordance with a direction of torque of the rotor, and a vehicle loaded with the rotational electric machine.
    Type: Grant
    Filed: August 30, 2001
    Date of Patent: March 2, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Kim Houng Joong, Satoru Okabe
  • Patent number: 6700269
    Abstract: A yoke housing that receives an armature has a plurality of permanent magnets (primary magnetic poles) secured to an inner peripheral surface of the yoke housing. Furthermore, the yoke housing includes a plurality of groove-like reduced thickness portions for increasing a magnetic resistance. Each reduced thickness portion extends along a center line of a corresponding one of the permanent magnets.
    Type: Grant
    Filed: April 27, 2001
    Date of Patent: March 2, 2004
    Assignee: Asmo Co., Ltd.
    Inventors: Katsuhiko Torii, Kengo Yamamura, Hiroaki Yamamoto
  • Patent number: 6700270
    Abstract: A synchronous induction motor realizing a great reluctance torque by concentrating a magnetomotive force generated by a rotor provided with a permanent magnet having a two-pole structure, and having a high efficiency. The synchronous induction motor has a stator provided with a stator winding, a rotor rotating within the stator, a cage-type secondary electric conductor provided in a peripheral portion of a rotor yoke portion constituting the rotor, and a permanent magnet inserted into the rotor yoke portion and having a two-pole structure, and the magnetomotive force generated by one pole of the rotor is set to a value equal to or less than 10% of a peak value in a predetermined range near an electrical angle of 0 degrees or 180 degrees.
    Type: Grant
    Filed: December 5, 2001
    Date of Patent: March 2, 2004
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Toshihito Yanashima, Kazuhiko Arai, Masaaki Takezawa, Keijiro Igarashi, Eiichi Murata, Masanori Yamashita, Yoshitomo Nakayama, Shigemi Koiso, Noboru Onodera
  • Patent number: 6700271
    Abstract: A hybrid synchronous motor comprising a rotor and stators, wherein the stator has at least one assembly (7) having a structure in which ferromagnetic rings (2, 3) formed with cogs on the both inner and outer circumferences thereof, are arranged coaxially, and a coil winding (8) is wound on the assembly (7) so as to be positioned between cogs. The hybrid synchronous motor exhibits a high magnetic flux density in the air gap as the result of transverse magnetic flux of the permanent magnets combined with longitudinal magnetic flux of the coils and high active surface at the air gap due to double (inner and outer) air gaps. Further, since it contains only a single set of stator coils and it has merely a small number of assembling parts and conventional techniques of fabrication may be applied, the motor is cheap in construction. Furthermore, the motor exhibits an excellent energy efficiency due to only small ohmic losses in the coils.
    Type: Grant
    Filed: September 27, 2001
    Date of Patent: March 2, 2004
    Assignee: Harmonic Drive Systems, Inc.
    Inventor: Andrej Detela
  • Patent number: 6700272
    Abstract: A reluctance motor with a stator (1) which has a three-phase current stator winding for generating a rotary magnetic field and a rotor (3) which is located on the shaft (2) and which is made primarily of a ferromagnetic material. The rotor is formed of a predetermined number of angular regions of the same peripheral angle which adjoin one another in a circumferential direction and preferably have at least one pair of flux guidance regions (10, 11) facing the stator (1), with flux guidance properties which differ in the main direction of the rotary field.
    Type: Grant
    Filed: July 11, 2000
    Date of Patent: March 2, 2004
    Assignee: EMF 97 Elektro-Maschinen-Vertrieb-Magnettechnik- und Forschungs GmbH
    Inventor: Juergen Lindner
  • Patent number: 6700273
    Abstract: A gas transfer machine for use as a vacuum pump, for example, has a pump rotor mounted on a rotatable shaft for transferring a gas, and a reluctance-type motor for rotating the rotatable shaft. The reluctance-type motor has a stator, a motor rotor surrounded by the stator, and a shield member isolating the stator from the motor rotor. The motor rotor is directly coupled to the rotatable shaft and has a plurality of magnetic salient poles.
    Type: Grant
    Filed: August 4, 2000
    Date of Patent: March 2, 2004
    Assignee: Ebara Corporation
    Inventors: Yoshinori Ojima, Toshiharu Nakazawa, Shinichi Sekiguchi, Nobuharu Noji
  • Patent number: 6700274
    Abstract: A rotor assembly includes at least one superconducting winding assembly positioned within a cryogenic region of the rotor assembly, and a cantilevered member, mechanically coupled between the at least one superconducting winding assembly and the shaft. The cantilevered member extends between the non-cryogenic region and cryogenic region of the rotor assembly. The at least one superconducting winding assembly, in operation, generates a magnetic flux linking the stator assembly.
    Type: Grant
    Filed: July 19, 2001
    Date of Patent: March 2, 2004
    Assignee: American Superconductor Corporation
    Inventors: Bruce B. Gamble, Raymond T. Howard, John Mirageas, John P. Voccio, Dariusz Antoni Bushko, Peter M. Winn, Gregory L. Snitchler, Ronald A. Malzone